/*jshint multistr:true, curly: false */
/*global jQuery:false, define: false */
/**
 * jRange - Awesome range control
 * 
 * Written by ---------- Nitin Hayaran (nitinhayaran@gmail.com)
 * 
 * Licensed under the MIT (MIT-LICENSE.txt).
 * 
 * @author Nitin Hayaran
 * @version 0.1-RELEASE
 * 
 * Dependencies ------------ jQuery (http://jquery.com)
 * 
 */
;
(function($, window, document, undefined) {
	'use strict';

	var jRange = function() {
		return this.init.apply(this, arguments);
	};
	jRange.prototype = {
		defaults : {
			onstatechange : function() {
			},
			isRange : false,
			showLabels : true,
			showScale : true,
			step : 1,
			format : '%s',
			theme : 'theme-green',
			width : 300,
			disable : false
		},
		template : '<div class="slider-container">\
			<div class="back-bar">\
                <div class="selected-bar"></div>\
                <div class="pointer low"></div><div class="pointer-label">123456</div>\
                <div class="pointer high"></div><div class="pointer-label">456789</div>\
                <div class="clickable-dummy"></div>\
            </div>\
            <div class="scale"></div>\
		</div>',
		init : function(node, options) {
			this.options = $.extend({}, this.defaults, options);
			this.inputNode = $(node);
			this.options.value = this.inputNode.val()
					|| (this.options.isRange ? this.options.from + ','
							+ this.options.from : this.options.from);
			this.domNode = $(this.template);
			this.domNode.addClass(this.options.theme);
			this.inputNode.after(this.domNode);
			this.domNode.on('change', this.onChange);
			this.pointers = $('.pointer', this.domNode);
			this.lowPointer = this.pointers.first();
			this.highPointer = this.pointers.last();
			this.labels = $('.pointer-label', this.domNode);
			this.lowLabel = this.labels.first();
			this.highLabel = this.labels.last();
			this.scale = $('.scale', this.domNode);
			this.bar = $('.selected-bar', this.domNode);
			this.clickableBar = this.domNode.find('.clickable-dummy');
			this.interval = this.options.to - this.options.from;
			this.render();
		},
		render : function() {
			// Check if inputNode is visible, and have some width, so that we
			// can set slider width accordingly.
			if (this.inputNode.width() === 0 && !this.options.width) {
				console.log('jRange : no width found, returning');
				return;
			} else {
				this.domNode
						.width(this.options.width || this.inputNode.width());
				this.inputNode.hide();
			}

			if (this.isSingle()) {
				this.lowPointer.hide();
				this.lowLabel.hide();
			}
			if (!this.options.showLabels) {
				this.labels.hide();
			}
			this.attachEvents();
			if (this.options.showScale) {
				this.renderScale();
			}
			this.setValue(this.options.value);
		},
		isSingle : function() {
			if (typeof (this.options.value) === 'number') {
				return true;
			}
			return (this.options.value.indexOf(',') !== -1 || this.options.isRange) ? false
					: true;
		},
		attachEvents : function() {
			this.clickableBar.click($.proxy(this.barClicked, this));
			this.pointers.on('mousedown touchstart', $.proxy(this.onDragStart,
					this));
			this.pointers.bind('dragstart', function(event) {
				event.preventDefault();
			});
		},
		onDragStart : function(e) {
			if (this.options.disable
					|| (e.type === 'mousedown' && e.which !== 1)) {
				return;
			}
			e.stopPropagation();
			e.preventDefault();
			var pointer = $(e.target);
			this.pointers.removeClass('last-active');
			pointer.addClass('focused last-active');
			this[(pointer.hasClass('low') ? 'low' : 'high') + 'Label']
					.addClass('focused');
			$(document).on('mousemove.slider touchmove.slider',
					$.proxy(this.onDrag, this, pointer));
			$(document).on('mouseup.slider touchend.slider touchcancel.slider',
					$.proxy(this.onDragEnd, this));
		},
		onDrag : function(pointer, e) {
			e.stopPropagation();
			e.preventDefault();

			if (e.originalEvent.touches && e.originalEvent.touches.length) {
				e = e.originalEvent.touches[0];
			} else if (e.originalEvent.changedTouches
					&& e.originalEvent.changedTouches.length) {
				e = e.originalEvent.changedTouches[0];
			}

			var position = e.clientX - this.domNode.offset().left;
			this.domNode.trigger('change', [ this, pointer, position ]);
		},
		onDragEnd : function(e) {
			this.pointers.removeClass('focused');
			this.labels.removeClass('focused');
			$(document).off('.slider');
		},
		barClicked : function(e) {
			if (this.options.disable)
				return;
			var x = e.pageX - this.clickableBar.offset().left;
			if (this.isSingle())
				this.setPosition(this.pointers.last(), x, true, true);
			else {
				var pointer = Math.abs(parseInt(this.pointers.first().css(
						'left'), 10)
						- x + this.pointers.first().width() / 2) < Math
						.abs(parseInt(this.pointers.last().css('left'), 10) - x
								+ this.pointers.first().width() / 2) ? this.pointers
						.first()
						: this.pointers.last();
				this.setPosition(pointer, x, true, true);
			}
		},
		onChange : function(e, self, pointer, position) {
			var min, max;
			if (self.isSingle()) {
				min = 0;
				max = self.domNode.width();
			} else {
				min = pointer.hasClass('high') ? self.lowPointer.position().left
						+ self.lowPointer.width() / 2
						: 0;
				max = pointer.hasClass('low') ? self.highPointer.position().left
						+ self.highPointer.width() / 2
						: self.domNode.width();
			}
			var value = Math.min(Math.max(position, min), max);
			self.setPosition(pointer, value, true);
		},
		setPosition : function(pointer, position, isPx, animate) {
			var leftPos, lowPos = this.lowPointer.position().left, highPos = this.highPointer
					.position().left, circleWidth = this.highPointer.width() / 2;
			if (!isPx) {
				position = this.prcToPx(position);
			}
			if (pointer[0] === this.highPointer[0]) {
				highPos = Math.round(position - circleWidth);
			} else {
				lowPos = Math.round(position - circleWidth);
			}
			pointer[animate ? 'animate' : 'css']({
				'left' : Math.round(position - circleWidth)
			});
			if (this.isSingle()) {
				leftPos = 0;
			} else {
				leftPos = lowPos + circleWidth;
			}
			this.bar[animate ? 'animate' : 'css']({
				'width' : Math.round(highPos + circleWidth - leftPos),
				'left' : leftPos
			});
			this.showPointerValue(pointer, position, animate);
			this.isReadonly();
		},
		// will be called from outside
		setValue : function(value) {
			var values = value.toString().split(',');
			this.options.value = value;
			var prc = this.valuesToPrc(values.length === 2 ? values : [ 0,
					values[0] ]);
			if (this.isSingle()) {
				this.setPosition(this.highPointer, prc[1]);
			} else {
				this.setPosition(this.lowPointer, prc[0]);
				this.setPosition(this.highPointer, prc[1]);
			}
		},
		renderScale : function() {
			var s = this.options.scale
					|| [ this.options.from, this.options.to ];
			var prc = Math.round((100 / (s.length - 1)) * 10) / 10;
			var str = '';
			for (var i = 0; i < s.length; i++) {
				str += '<span style="left: ' + i * prc + '%">'
						+ (s[i] != '|' ? '<ins>' + s[i] + '</ins>' : '')
						+ '</span>';
			}
			this.scale.html(str);

			$('ins', this.scale).each(function() {
				$(this).css({
					marginLeft : -$(this).outerWidth() / 2
				});
			});
		},
		getBarWidth : function() {
			var values = this.options.value.split(',');
			if (values.length > 1) {
				return parseInt(values[1], 10) - parseInt(values[0], 10);
			} else {
				return parseInt(values[0], 10);
			}
		},
		showPointerValue : function(pointer, position, animate) {
			var label = $('.pointer-label', this.domNode)[pointer
					.hasClass('low') ? 'first' : 'last']();
			var text;
			var value = this.positionToValue(position);
			if ($.isFunction(this.options.format)) {
				var type = this.isSingle() ? undefined : (pointer
						.hasClass('low') ? 'low' : 'high');
				text = this.options.format(value, type);
			} else {
				text = this.options.format.replace('%s', value);
			}

			var width = label.html(text).width(), left = position - width / 2;
			left = Math.min(Math.max(left, 0), this.options.width - width);
			label[animate ? 'animate' : 'css']({
				left : left
			});
			this.setInputValue(pointer, value);
		},
		valuesToPrc : function(values) {
			var lowPrc = ((values[0] - this.options.from) * 100 / this.interval), highPrc = ((values[1] - this.options.from) * 100 / this.interval);
			return [ lowPrc, highPrc ];
		},
		prcToPx : function(prc) {
			return (this.domNode.width() * prc) / 100;
		},
		positionToValue : function(pos) {
			var value = (pos / this.domNode.width()) * this.interval;
			value = value + this.options.from;
			return Math.round(value / this.options.step) * this.options.step;
		},
		setInputValue : function(pointer, v) {
			// if(!isChanged) return;
			if (this.isSingle()) {
				this.options.value = v.toString();
			} else {
				var values = this.options.value.split(',');
				if (pointer.hasClass('low')) {
					this.options.value = v + ',' + values[1];
				} else {
					this.options.value = values[0] + ',' + v;
				}
			}
			if (this.inputNode.val() !== this.options.value) {
				this.inputNode.val(this.options.value);
				this.options.onstatechange.call(this, this.options.value);
			}
		},
		getValue : function() {
			return this.options.value;
		},
		isReadonly : function() {
			this.domNode.toggleClass('slider-readonly', this.options.disable);
		},
		disable : function() {
			this.options.disable = true;
			this.isReadonly();
		},
		enable : function() {
			this.options.disable = false;
			this.isReadonly();
		},
		toggleDisable : function() {
			this.options.disable = !this.options.disable;
			this.isReadonly();
		}
	};

	/*
	 * $.jRange = function (node, options) { var jNode = $(node);
	 * if(!jNode.data('jrange')){ jNode.data('jrange', new jRange(node,
	 * options)); } return jNode.data('jrange'); };
	 * 
	 * $.fn.jRange = function (options) { return this.each(function(){
	 * $.jRange(this, options); }); };
	 */

	var pluginName = 'jRange';
	// A really lightweight plugin wrapper around the constructor,
	// preventing against multiple instantiations
	$.fn[pluginName] = function(option) {
		var args = arguments, result;

		this
				.each(function() {
					var $this = $(this), data = $.data(this, 'plugin_'
							+ pluginName), options = typeof option === 'object'
							&& option;
					if (!data) {
						$this.data('plugin_' + pluginName, (data = new jRange(
								this, options)));
						$(window).resize(function() {
							data.setValue(data.getValue());
						}); // Update slider position when window is resized to
						// keep it in sync with scale
					}
					// if first argument is a string, call silimarly named
					// function
					// this gives flexibility to call functions of the plugin
					// e.g.
					// - $('.dial').plugin('destroy');
					// - $('.dial').plugin('render', $('.new-child'));
					if (typeof option === 'string') {
						result = data[option].apply(data, Array.prototype.slice
								.call(args, 1));
					}
				});

		// To enable plugin returns values
		return result || this;
	};

})(jQuery, window, document);